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<title>Using as: AArch64 Extensions</title>

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<a name="AArch64-Extensions"></a>
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Next: <a href="AArch64-Syntax.html#AArch64-Syntax" accesskey="n" rel="next">AArch64 Syntax</a>, Previous: <a href="AArch64-Options.html#AArch64-Options" accesskey="p" rel="prev">AArch64 Options</a>, Up: <a href="AArch64_002dDependent.html#AArch64_002dDependent" accesskey="u" rel="up">AArch64-Dependent</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Architecture-Extensions"></a>
<h4 class="subsection">9.1.2 Architecture Extensions</h4>

<p>The table below lists the permitted architecture extensions that are
supported by the assembler and the conditions under which they are
automatically enabled.
</p>
<p>Multiple extensions may be specified, separated by a <code>+</code>.
Extension mnemonics may also be removed from those the assembler
accepts.  This is done by prepending <code>no</code> to the option that adds
the extension.  Extensions that are removed must be listed after all
extensions that have been added.
</p>
<p>Enabling an extension that requires other extensions will
automatically cause those extensions to be enabled.  Similarly,
disabling an extension that is required by other extensions will
automatically cause those extensions to be disabled.
</p>
<table>
<thead><tr><th width="12%">Extension</th><th width="17%">Minimum Architecture</th><th width="17%">Enabled by default</th><th width="54%">Description</th></tr></thead>
<tr><td width="12%"><code>crc</code></td><td width="17%">ARMv8-A</td><td width="17%">ARMv8.1-A or later</td><td width="54%">Enable CRC instructions.</td></tr>
<tr><td width="12%"><code>crypto</code></td><td width="17%">ARMv8-A</td><td width="17%">No</td><td width="54%">Enable cryptographic extensions.  This implies <code>fp</code> and <code>simd</code>.</td></tr>
<tr><td width="12%"><code>fp</code></td><td width="17%">ARMv8-A</td><td width="17%">ARMv8-A or later</td><td width="54%">Enable floating-point extensions.</td></tr>
<tr><td width="12%"><code>fp16</code></td><td width="17%">ARMv8.2-A</td><td width="17%">ARMv8.2-A or later</td><td width="54%">Enable ARMv8.2 16-bit floating-point support.  This implies
 <code>fp</code>.</td></tr>
<tr><td width="12%"><code>lor</code></td><td width="17%">ARMv8-A</td><td width="17%">ARMv8.1-A or later</td><td width="54%">Enable Limited Ordering Regions extensions.</td></tr>
<tr><td width="12%"><code>lse</code></td><td width="17%">ARMv8-A</td><td width="17%">ARMv8.1-A or later</td><td width="54%">Enable Large System extensions.</td></tr>
<tr><td width="12%"><code>pan</code></td><td width="17%">ARMv8-A</td><td width="17%">ARMv8.1-A or later</td><td width="54%">Enable Privileged Access Never support.</td></tr>
<tr><td width="12%"><code>profile</code></td><td width="17%">ARMv8.2-A</td><td width="17%">No</td><td width="54%">Enable statistical profiling extensions.</td></tr>
<tr><td width="12%"><code>ras</code></td><td width="17%">ARMv8-A</td><td width="17%">ARMv8.2-A or later</td><td width="54%">Enable the Reliability, Availability and Serviceability
 extension.</td></tr>
<tr><td width="12%"><code>rdma</code></td><td width="17%">ARMv8-A</td><td width="17%">ARMv8.1-A or later</td><td width="54%">Enable ARMv8.1 Advanced SIMD extensions.  This implies <code>simd</code>.</td></tr>
<tr><td width="12%"><code>simd</code></td><td width="17%">ARMv8-A</td><td width="17%">ARMv8-A or later</td><td width="54%">Enable Advanced SIMD extensions.  This implies <code>fp</code>.</td></tr>
</table>




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